@article{SM_2018_209_12_a1,
     author = {V. V. Vedyushkina and I. S. Kharcheva},
     title = {Billiard books model all three-dimensional bifurcations of integrable {Hamiltonian} systems},
     journal = {Sbornik. Mathematics},
     pages = {1690--1727},
     publisher = {mathdoc},
     volume = {209},
     number = {12},
     year = {2018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2018_209_12_a1/}
}